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| author |   Baolin Wang <baolin.wang@linaro.org> | 2018-08-16 20:54:49 +0800 |
|---|---|---|
| committer |   Mark Brown <broonie@kernel.org> | 2018-08-29 11:48:46 +0100 |
| commit | eeaceb8b7d1fb64b6030249ca0dd1d902ef3069e (patch) | |
| tree | 9fc7bccaf610a10624f032087482e50e43734bdc /include/linux/spi | |
| parent | spi: sh-msiof: Add r8a774a1 support (diff) | |
| download | linux-dev-eeaceb8b7d1fb64b6030249ca0dd1d902ef3069e.tar.xz linux-dev-eeaceb8b7d1fb64b6030249ca0dd1d902ef3069e.zip | |
spi: Introduce one new field to set word delay
For some SPI controllers, after each word size (specified by bits_per_word)
transimission, the hardware need some delay to make sure the slave has enough
time to receive the whole data.
So introducing one new 'word_delay' field of struct spi_tansfer for slave
devices to set this inter word delay time.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include/linux/spi')
| -rw-r--r-- | include/linux/spi/spi.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index a64235e05321..d698f9db3484 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -711,6 +711,8 @@ extern void spi_res_release(struct spi_controller *ctlr, * @delay_usecs: microseconds to delay after this transfer before * (optionally) changing the chipselect status, then starting * the next transfer or completing this @spi_message. + * @word_delay: clock cycles to inter word delay after each word size + * (set by bits_per_word) transmission. * @transfer_list: transfers are sequenced through @spi_message.transfers * @tx_sg: Scatterlist for transmit, currently not for client use * @rx_sg: Scatterlist for receive, currently not for client use @@ -793,6 +795,7 @@ struct spi_transfer { u8 bits_per_word; u16 delay_usecs; u32 speed_hz; + u16 word_delay; struct list_head transfer_list; }; |